After reviewing the design for their new VNX, your customer has requested further explanation of
the hot spare algorithm used by the array. You propose the following scenario:
RAID group 200 consists of five 600 GB 10K SAS drives in a RAID 5 configuration. Within this
RAID group there are three 25 GiB LUNs. One of the five drives has just failed.
In your scenario, which hot spare drive would the array first select to replace the failed drive?

A.
SAS: 300 GB

B.
SAS: 600 GB

C.
NL-SAS: 2 TB

D.
EFD. 100 GB

Explanation:
http://www.emc.com/collateral/software/technical-documentation/h8281-atmos-ve-vnxdeployment.pdf(page 28 and 30)